Just a swag (Scientific Wild Ass Guess) but could it boil down to the following:

1. Most of the heavy hitters on this platform are US-based, and....

2. We've just finished Thanksgiving, one of the largest US holidays. Maybe a significant portion of the active heavy hitters were traveling, taking time off, or otherwise not participating as much on the platform as usual?

How does this compare with the cycle last year at this time?

I could be completely off about this. As others mentioned, maybe people are just spending more time on Bitcoin or other cryptocurrencies via active trading. Bitcoin is over $9,965/ea as of this posting (yikes!) and opportunities for quick returns are undoubtedly tempting.

If any of my above suppositions are correct, there should be another decrease spike in late Dec (for Christmas / New Year's) but things should pick up again in January, as people often reset their goals and expectations around this time and become more productive.